/**
 * 日期格式化
 * @param format
 * @returns
 */
Date.prototype.format = function(format)
{
	var o = {
	"M+" : this.getMonth()+1, //month
	"d+" : this.getDate(),    //day
	"H+" : this.getHours(),   //hour
 	"m+" : this.getMinutes(), //minute
	"s+" : this.getSeconds(), //second
 	"q+" : Math.floor((this.getMonth()+3)/3),  //quarter
 	"S" : this.getMilliseconds() //millisecond
	}

	if(/(y+)/.test(format)) 
	{
		format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));
	}
	
 	for(var k in o)
	{
		if(new RegExp("("+ k +")").test(format))
		{
 			format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length));
		}
	}
	return format;
}